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Nitrous oxide and methane emissions from a Chinese wheat-rice cropping system under different tillage practices during the wheat-growing season

文献类型： 外文期刊

作者： Zhang, Yuefang 1 ; Sheng, Jing 1 ; Wang, Zichen 1 ; Chen, Liugen 1 ; Zheng, Jianchu 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Jiangsu, Peoples R China

关键词： Nitrous oxide;Methane;No-tillage;Reduced tillage;Rice paddy;Global warming potential

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：5.374； 五年影响因子：6.368 ）

ISSN：

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收录情况： SCI

摘要： The annual wheat (Triticum aestivum L.)-rice (Oryza sativa L) cropping system is the most important cereal production system in the Yangtze River Valley of China, in which various tillage systems are currently implemented during the wheat-growing season. The emissions of nitrous oxide (N2O) and methane (CH4) from the different tillage systems in this system remain unclear. We conducted a 3-year field experiment in a wheat-rice cropping system in a silt clay loam soil to investigate the effects of the type of tillage employed during the wheat-growing season (no-tillage (NT), reduced tillage (RT) or conventional tillage (CT)) on the emissions of N2O and CH4 using the static chamber method over three annual rotation cycles from the 2008 wheat season to the 2011 rice season. The results revealed that the adoption of an NT system during the wheat-growing season significantly increased CH4 emissions during both the wheat-growing season and the following rice-growing season. Over the three annual rotation cycles studied, the annual N2O emissions from the NT (2.24 kg N2O-N ha(-1)) and CT (2.01 kg N2O-N ha(-1)) treatments were similar to each other and significantly higher than those from the RI treatment (1.73 kg N2O-N ha(-1)); the annual CH4 emissions were significantly higher from the NT (100.1 kg CH4C ha(-1)) than the CT (83.7 kg CH4-C ha(-1)) and RT (73.9 kg CH4-C ha(-1)) systems. The overall results regarding the net global warming potential associated with annual N2O and CH4 emissions indicate that the conversion of conventional tillage to no-tillage systems during the wheat-growing season would intensify the radiative forcing in wheat-rice cropping systems in China. (C) 2014 Elsevier B.V. All rights reserved.

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